Games Like Catan On Steam. Depends on what you mean by interaction. The extension comes with additional tiles and other components that expand the map.
10 best city building tabletop games Play catan in the original implementation including many extensions, online with people from all over the world or compete against clever computer opponents. Rome is one of the many city building games that has you recreate the roman civilization from scratch.
Both the base game and the extension is fun to play.
It also increases the length of the game considerably. Steam has a great gallery of digital board games you can play all by yourself! If you dig games like settlers of catan, you'll love ticket to ride. There's a ton of dlc available for the digital edition as well, so you won't run out of content anytime soon.